Back pressure regulating valve and an electric type of a scroll compressor with the same

Abstract

Provided is a back pressure regulating valve and an electric type of a scroll compressor with the same. A valve of an electric scroll compressor for regulating a back pressure includes a valve housing including a first housing 11 , a second housing and a communicating passage 13 for connecting the first housing 11 to the second housing 12 ; and a piston 14 including a first piston 141 located within the first housing 11 , a second piston located within the second housing 12 and a connecting rod 143 for connecting the first piston 141 to the second piston 142 , wherein the piston 14 is configured to move up and down within the first and the second housing 11, 12.

What is claimed is: 
     
       1. A valve of an electric scroll compressor for regulating a back pressure, comprising:
 a valve housing including a first housing, a second housing and a communicating passage for connecting the first housing to the second housing; and 
 a piston including a first piston located within the first housing, a second piston located within the second housing and a connecting rod for connecting the first piston to the second piston, 
 wherein the piston is configured to move up and down within the first and the second housing, 
 wherein the cross sectional size of the second housing is bigger than that of the first housing, and 
 wherein a first housing upper cylinder is connected to a discharging chamber, a first housing lower cylinder is connected to a back pressure chamber, a first back pressure chamber communicating passage is formed at a side of the first housing for the first housing upper cylinder to communicate with a back pressure chamber when the piston reaches at a bottom dead center, a second upper cylinder is connected to a suction chamber and a second lower cylinder is connected to the back pressure chamber, and a first suction chamber communicating passage is formed at a side of the second housing for the second housing lower cylinder to communicate with the suction chamber when the piston reaches at a top dead center. 
 
     
     
       2. The valve according to  claim 1 , further comprising elastic units installed at the first housing and the second housing for limiting a movement of the first piston and the second piston and at the same time for supplying a restoring force. 
     
     
       3. The valve according to  claim 1 , wherein a pressure ratio is represented as rp=(A2−A0)/A1, wherein A0, A1 and A2 are cross sectional sizes of the connecting rod, the first piston and the second piston, respectively. 
     
     
       4. A scroll compressor, comprising:
 a fixed scroll; 
 an orbiting scroll for orbiting around the fixed scroll; 
 a back pressure chamber formed at a rear surface of a head plate of the orbiting scroll; and 
 a valve for regulating a back pressure according to  claim 1 . 
 
     
     
       5. A scroll compressor, comprising:
 a fixed scroll; 
 an orbiting scroll for orbiting around the fixed scroll; 
 a back pressure chamber formed at a rear surface of a head plate of the orbiting scroll; and 
 a valve for regulating a back pressure according to  claim 2 . 
 
     
     
       6. A scroll compressor, comprising:
 a fixed scroll; 
 an orbiting scroll for orbiting around the fixed scroll; 
 a back pressure chamber formed at a rear surface of a head plate of the orbiting scroll; and 
 a valve for regulating a back pressure according to  claim 3 .